Idk if every NPC needs one or more additional routes.I can agree for different options but isn't it too much to make Soft and loving route for every Character? Whitney is a bit softer (sometimes) with max love/min dom, I think it's enough, and I suppose developer share same opinion))
But it is definitely not too much. It scales linearly. You can add theses routes one by one. You don't have to finish a route in one go. If you don't want to, it does not affect any other NPC.
Preggo stuff on the other hand does not scale at all, it affects every fucking interaction. It also affects most of the non fucking interactions.
And all future interaction, fucking or not.